These two plzz:) I RLLY NEeD HE:LP

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1